The document discusses a city-to-city cooperation between Surabaya, Indonesia and Kitakyushu, Japan to address their shared waste management problems. Both cities previously faced severe pollution issues due to rapid industrialization that degraded the environment. Through the CITYNET framework and with support from JICA, Surabaya and Kitakyushu established a partnership to share knowledge and expertise on improving waste management systems. The cooperation helped Surabaya transition to a more sustainable community-based waste governance system based on Kitakyushu's experience overcoming similar issues in the past.